http://schaffhauser.me/Warcraft#PetList shows this pet, in my inventory, as the highest possible health... and thats at uncommon. I will be curious to pop a rare stone on this. Could be a super tanky pet with shell and his absorb attack.

This guy is a crazy good tanking and power levelling pet. I take Snap (critter dmg), Healing Wave, and Shell Shield. I start combat with Shell Shield up - maintain that, and snap my way to victory with occasional healing waves. I like to use this guy around Half Hill with a low level pet in my group, I start combat with that pet and then kill everything with the crab. With +dmg to critters you clear a team in no time with very little loss of health overall.

This is a pretty amazing pet. I take Poison Spit, Brittle Webbing, and Leech Life. Start every combat with Brittle webbing then alternate leech life with upkeeping the two dots. I can take on entire groups of battle pets and lose very little health. Its great for power levelling up lower level pets.